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【单选题】
已知变量 X 的平均数是 4,S=1.2,当 X=6.4 时,对应的标准分应是A.
1.2
B.
2.0
C.
2.8
D.
5.2
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皮皮学刷刷变学霸
举一反三
【单选题】下列关于肺泡表面活性物质的生理意义错误的是（2012年湘南学院 “专升本”真题/2009年/2011年临床执业医师真题）
A.
维持肺泡的扩张状态
B.
降低肺泡表面张力
C.
稳定肺泡容积
D.
降低肺的顺应性
E.
防止毛细血管内的液体流入肺泡内
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